docs: def __add_options(parser):
      """
      Add the `Configure` options to a option-parser instance or a
      option group.
      """
      parser.add_option('--upx-dir', default=None,
                        help='Directory containing UPX.')
      parser.add_option('-C', '--configfile',
                        default=DEFAULT_CONFIGFILE,
                        dest='configfilename',
                        help='Name of generated configfile (default: %default)')